Gunpowder is generally believed __________ in ancient China.

I can’t do my lessons with so much noise going on, Tom. I’d appreciate ______ the radio down.

In those days, ________ ‘prizefighters’ because they fought with bare fists for prize money.

Lots of people were reported______ in the earthquake, but so far we haven’t found out the exact number yet.

Having mastered the technologies of manned spacecraft, China became the third country in the world ______ manned spaceflight independently.

______ sweet, this type of flower sells the best in the market.

______ Chief Engineer, as his family had expected, made his father happy and proud.

Storm chasing is so dangerous that some chasers are often hurt in accidents ______ by driving in a heavy rain.

Believe it or not, crying is a way you can imagine ______ pressure.

______ into English, the sentence was found to have an entirely different word order.

Passeagers are permitted        only one piece of hand luggage onto the plane.

She is believed______  the train, otherwise she would have arrived here by now.   

–Who should be responsible for the accident? -The boss, not the workers. They just carried out the order                  .

Distinguished guests and friends, welcome to our school.             the ceremony of the 50th Anniversary this morning are our alumni（校友） from home and abroad.

I send you 100 dollars today, the rest             in a year.

More highways have been built in China,___________it much easier for people to trave form one place to another.                            

Claire had luggage        an hour befor her plane left.           

Today we have chat rooms, text messaging, emailing… but we seem ______ the art of communicating face-to-face.

At one point I made up my mind to talk to Uncle Sam. Then I changed my mind, ______ that he could do nothing to help.

The rare fish, ______ from the cooking pot, has been returned to the sea.